Parent Company Financial Information - Statements of Financial Condition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]
Percentage of capital stock of the Bank held (as a percent)	100.00%
Assets
Other assets	$ 368,996	$ 253,871
Total assets	19,026,645	21,688,017
Liabilities
Subordinated debentures	331,842	331,204
Accrued expenses and other liabilities	216,596	206,023
Total liabilities	16,144,064	18,889,628
Total stockholders’ equity	2,882,581	2,798,389	$ 2,886,311	$ 2,746,649
Total liabilities and stockholders’ equity	19,026,645	21,688,017
Corporation
Assets
Cash and cash equivalents	72,696	17,712
Investment in subsidiaries	3,145,886	3,118,313
Other assets	5,180	1,214
Total assets	3,223,762	3,137,239
Liabilities
Subordinated debentures	331,842	331,204
Accrued expenses and other liabilities	9,339	7,646
Total liabilities	341,181	338,850
Total stockholders’ equity	2,882,581	2,798,389
Total liabilities and stockholders’ equity	$ 3,223,762	$ 3,137,239